Brillouin propagation modes in optical lattices: interpretation in terms of nonconventional stochastic resonance
L. Sanchez-Palencia, F. -R. Carminati, M. Schiavoni, F. Renzoni, G. Grynberg
Abstract
We report the first direct observation of Brillouin-like propagation modes in a dissipative periodic optical lattice. This has been done by observing, in both theoretical and experimental work, a resonant behaviour of the spatial diffusion coefficient in the direction corresponding to the propagation mode with the phase velocity of the moving intensity modulation used to excite these propagation modes. Furthermore, we show theoretically that the amplitude of the Brillouin mode is a nonmonotonic function of the strength of the noise corresponding to the optical pumping, and discuss this behaviour in terms of nonconventional stochastic resonance.
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